the answer is -$97 for sure.
9 h) H( [1 ]2 c# h4 C& m4 _( `4 fThink about it this way d+ z; p5 L& @: F
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
6 ?- t& F! h( B) x+ Y: S; e/ f5.39.217.77:88982) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |